If your concern is third-party reliability but you'd still like a password manager, I'd say your best bet would be pass + git. pass uses gpg to encrypt each password separately in a file structure, and works very well with any sort of git repository making it accessible across devices. Depending on how you set it up it can be 100% in your control with minimal configuration (in my case though I've been lazy and just hooked it up to a private GitHub repository).